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The college president asks the statistics teacher to estimate the average age of the students at their college. How large a sample is necessary if the teacher would like to be 98% confident that the estimate should be accurate within 1 year? From a previous study, the standard deviation of the ages is known to be 3 years.
Calculate the population mean and population standard deviation.
This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
Determine the likelihood of accepting a lot which is 1% defective?
Any value which is based on having measured a sample is called:
What is the probability that none can transact business in a foreign language?
The 'interaction effect' was also important. By using the means in the table above write a statement explaining how the anti-anxiety drug appears to affect anxiety. Are the outcomes consistent with the hypothesis proposed by the researchers?
Write all the possible samples of size 2 and calculate the average or median of each one.
Establish a 99% confidence interval for the difference in the proportion of suburban and urban housewives who own IPod.
Using sample, determine a 98% confidence interval for mean weight of whole daily output.
Compare two month moving average also exponential smoothing using MAD. The subsiquent data represents demand for company ABC's products for the last 10 months.
Utilizing the .05 level, do the results support the psychologists' theory. A psychologist theorized where people can hear better when they have just eaten a large meal.
The best estimator or appreciative of the population proportion is 0.45. How large must the sample be?
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